Re: Cooldown time?

Bob Weber posted:

> Refractors have zero cool down time.

Well, this isn't exactly true.  When the temperature difference between 
indoors and outdoors is less than 10 or maybe 15 degrees F, then the cooldown 
time for a refractor is fairly brief (a few minutes at most, and often only 
the time needed to set the scope up and get your materials ready).  However, 
if it is greater than this, the scope does need to cool down for a significant 
period, although that cooldown is somewhat faster than seen with other 
instruments like Newtonians or Schmidt-Cassegrains (unless cooling fans are 
employed).  Clear skies to you.
--
David W. Knisely  [EMAIL PROTECTED]
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

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